I'm still working on building my first 3D printer, but I am a little perplexed by the heated build platform and cooling fan issues.
It seems that the common way to prevent warping is to use a heated table (or a heated build chamber) to keep the part in a constantly relaxed state just near the softening point of the plastic. It strikes me that this is a little at odds with wanting to cool the extruded filament quickly to get sharp prints. I'm thinking of something where after each layer is printed, there is an annealing step where the part is scanned underneath a hot wire or heat lamp to anneal the top layer to eliminate the stresses between it and the layers below. Because you are only heating & cooling the top layer, you should be able to do it pretty quickly. Otherwise the bulk of the part is kept cool rather than hot during printing. The idea is that doing the annealing in a separate step might be more forgiving than trying to find just the right set parameters to get filament extruded and cooled at just the right temps and rates.
I know that the heated table is also used for adhesion, but adhesion would be less of a problem if the part weren't trying to warp.
Has anyone tried anything like this, or is warping pretty much a solved problem with the heated table?
It seems that the common way to prevent warping is to use a heated table (or a heated build chamber) to keep the part in a constantly relaxed state just near the softening point of the plastic. It strikes me that this is a little at odds with wanting to cool the extruded filament quickly to get sharp prints. I'm thinking of something where after each layer is printed, there is an annealing step where the part is scanned underneath a hot wire or heat lamp to anneal the top layer to eliminate the stresses between it and the layers below. Because you are only heating & cooling the top layer, you should be able to do it pretty quickly. Otherwise the bulk of the part is kept cool rather than hot during printing. The idea is that doing the annealing in a separate step might be more forgiving than trying to find just the right set parameters to get filament extruded and cooled at just the right temps and rates.
I know that the heated table is also used for adhesion, but adhesion would be less of a problem if the part weren't trying to warp.
Has anyone tried anything like this, or is warping pretty much a solved problem with the heated table?